Frustrated Las Vegas police ask for public's help in mass shooting

After five days of scouring the life of Las Vegas gunman Stephen Paddock and chasing 1,000 leads, investigators confessed Friday they still don't know what drove him to mass murder, and they announced plans to put up billboards appealing for the public's help.

Investigators have examined Paddock's politics, his finances, any possible radicalization and his social behavior — typical investigative avenues that have helped uncover the motive in past shootings.

"We still do not have a clear motive or reason why," Clark County Undersheriff Kevin McMahill said. "We have looked at literally everything."

The FBI announced that billboards would go up around the city asking anyone with information to phone 800-CALL-FBI.

"If you know something, say something," said Aaron Rouse, agent in charge of the Las Vegas FBI office. "We will not stop until we have the truth."

An open door a few rooms away from Paddock's suite set off an alarm that prompted a response from a security guard, Las Vegas Metropolitan Police Department Undersheriff Kevin C. McMahill said Friday.

Authorities believe that the guard drew the attention of Paddock away from the chaos below and toward the hallway outside his room.

The guard, Jesus Campos, was shot in the leg while checking on the alarm, and according to a police-reported timeline, Paddock never fired on the crowd below again.

The alarm from a room "a number of doors down" from Paddock's likely was a coincidence, McMahill said. The door was not forced open, had been open for a while, and Paddock didn't have the keys to that room. McMahill said that door either had been left open or didn't shut completely.

Paddock took his own life, authorities have said, after killing 58 people and causing injury to about 500 more.

McMahill spoke to CNN after telling reporters at a news conference that investigators looking into Sunday's massacre have found no known nexus to terror or connections to ISIS.

They have no credible information as to Paddock's motive, despite more than 1,000 leads and tips, McMahill said at the news conference.

McMahill said authorities are confident there was not another shooter in Stephen Paddock's room, but are still trying to determine whether anyone else knew of Paddock's plans.

Other developments from the media briefing and McMahill's interview with CNN:

-- Authorities do not believe another person used Stephen Paddock's room key at the Mandalay Bay hotel.

-- McMahill called Campos a "true hero."

-- Investigators have reviewed "voluminous amounts of video" from many different locations including Mandalay Bay and have not seen any other person they think at this point is another suspect.

-- Asked about video on which Paddock might have discussed motive, McMahill said: "I am not aware that we have recovered any such video."

-- McMahill said police don't know what the killer was going to do with 50 pounds of explosives that were found in his car.

-- Paddock brought the guns and ammunition he had in his hotel suite over the course of several days, the undersheriff told CNN.

-- The FBI said it was going to put up billboards around Las Vegas seeking witnesses and people who might have interacted with the gunman.

Source: Shooter tried to buy tracer rounds

Paddock tried to buy tracer ammunition at a gun show in the Phoenix area in recent weeks, a law enforcement official briefed on the investigation tells CNN.

Paddock bought other ammunition at the show, but he couldn't obtain the tracer ammunition -- bullets with a pyrotechnic charge that, when the round is fired, leaves an illuminated trace of its path -- because the vendor didn't have any to sell, the official said.

Paddock did not use tracer bullets when he fired into the crowd at the Route 91 Harvest Festival Sunday night from his suite on the 32nd floor of the Mandalay Bay hotel, hundreds of yards away, killing 58 people and injuring hundreds of others.

The official explained that if Paddock had tracer ammunition, he would have had a more precise idea of where his shots were going in the darkness, and could have been more accurate.

In addition to the 23 weapons in his hotel suite, which he turned into a sniper's nest, Paddock had more than 50 pounds of explosive material and 1,600 rounds of ammunition in his car in the hotel parking lot, police said, fueling suspicion that he intended to survive the massacre.

"He was doing everything possible to see how he could escape," Las Vegas Police Sheriff Joseph Lombardo said, declining to detail specifics.

Authorities: Paddock acted alone

There was initial speculation that Paddock had outside help in perpetrating the shooting spree, but authorities now say there is nothing to suggest he had assistance.

Law enforcement officials briefed on the investigation told CNN they have seen no indication so far that Paddock had an accomplice or that anyone was aware of his attack planning.

Lombardo, the sheriff, had previously expressed skepticism that the gunman carried out his plan by himself.

"Do you think this was all accomplished on his own? You've got to make the assumption he had to have some help at some point," he said.

As the investigation grinds on, Las Vegas Metropolitan Police Department officers led the funeral of LVMPD officer Charleston Hartfield Thursday, who was among those gunned down at the Route 91 Harvest Festival country music event.

His body was escorted to Palm Downtown Mortuary and Cemetery, and a memorial was held for the slain police officer at Police Memorial Park in the northwest of the city -- one of several vigils in Las Vegas on Thursday evening.

Gun debate continues

In the wake of the deadly attack, the Eastside Cannary Casino Gun Show that was expected to be held in Las Vegas this weekend has been canceled, David Strow of Boyd Gaming Corporation tells CNN.

"This was a mutual decision with the show's organizers, given recent events, it was the prudent thing to do," Strow said.

Five days after the mass shooting, authorities still are trying to determine the motivation of the retired accountant, who had no criminal record and did not raise any flags while purchasing an arsenal of weapons.

Twelve of the 23 firearms found in the hotel suite had bump stocks -- legal accessories for semi-automatic rifles that allow a shooter to fire rounds more rapidly.

In the aftermath of Sunday's shooting, pro-gun Republican lawmakers and the National Rifle Association, the powerful pro-gun lobby, have suggested supporting a review of bump stocks.

Politicians from both sides of the aisle and lobbyists are now saying the controversial devices, which sell for under $200, should be subject to additional regulation.

US President Donald Trump is open to considering legislation that would ban bump stocks but wants to hear more information on the matter before making a final determination, the White House said Wednesday.

'Numbers' found on note

Lombardo said a note with numbers written on it was found in Paddock's room, according to the New York Times. Authorities are trying to analyze its meaning, but Lombardo didn't elaborate on whether they are significant or not.

"Lombardo said that it contained numbers that were being analyzed for their relevance, and that it was not a manifesto or suicide note," the Times reported.

Paddock had rented rooms at other festivals

Before checking into the Mandalay Bay days before the massacre, Paddock rented a room at a Las Vegas condo complex that overlooked the Life is Beautiful music festival.

In addition, in August, a person named Stephen Paddock reserved a room at Chicago's Blackstone Hotel during the city's Lollapalooza music festival, said Wagstaff Worldwide, which represents the hotel.

But that person never checked into the hotel, which overlooked the festival, Wagstaff Worldwide spokeswoman Emmy Carragher said.

It was not immediately clear whether the Stephen Paddock who booked the room was the same Stephen Paddock behind the Las Vegas massacre.

The Chicago Tribune, citing an anonymous law enforcement source, reported that it was the shooter Stephen Paddock who booked the room at the Blackstone Hotel.

Hairdresser: Paddock spoke about girlfriend's trip

Kallie Beig, who worked at the Great Clips in Mesquite, Paddock's hometown, told CNN exclusively that she had cut Paddock's hair at least three times over the past three years, and that every time he had come in, always early in the morning, he had smelled of strong liquor.

He would tell her that he'd been up all night gambling, she said.

The last time she saw him was two months before Sunday's tragedy, she said.

During his last visit, he told her he was planning on sending his girlfriend, Marilou Danley, to the Philippines and he was going to be alone. She did not discuss the trip with Danley personally.

"The last time I saw him was probably only about two months ago... he came in and got his hair cut, and again, smelled of alcohol, and his girlfriend was with him... doing her own thing, and he was telling me about her leaving to go to the Philippines."

She said that the interaction was normal and didn't raise any red flags with her.

"He was going to be home alone hanging out for a while by himself but it wasn't anything weird, it wasn't anything that seemed off."

In her statement released through her attorney, Matt Lombard, Danley said the trip was a surprise.

"A little more than two weeks ago, Stephen told me he found a cheap ticket for me to the Philippines and that he wanted me to take a trip home to see my family," she said.

"Like all Filipinos abroad, I was excited to go home and see family and friends."

Being characterized their relationship as quite cold and distant -- she said she didn't see them interacting in any sort of intimate way.

After five days of scouring the life of Las Vegas gunman Stephen Paddock and chasing 1,000 leads, investigators confessed Friday they still don't know what drove him to mass murder, and they announced plans to put up billboards appealing for the public's help.